Rearrange the words/phrases to form a sentence.

1. 他出生一九九四年。 - He was born in 1994; 2. 她没有兄弟姐妹。 - She doesn't have siblings; 3. 他是小学生弟弟。 - He is a primary school student little brother; 4. 我今年上七年级。 - I am in the seventh grade this year.